Insulating refractories are a special class of refractories produced to have a highly porous structure with air entrapped therein. The presence of air in these pores reduces the conductive capacity of the refractories and therefore increasing their insulating characteristics. Apart from the natural occurring fire clays which has been adjudged an insulating refractories, other clays can have their insulating characteristics improved by the addition of materials like saw dust, rice husks and other farm wastes. An investigation was therefore carried out to ascertain the effects of rice husks addition on clay samples from Kaduna State as refractory insulating materials for industrial use. The results on linear shrinkage, thermal conductivity, apparent porosity and solid density of all the samples, showed that the linear shrinkage averaged 8.7% with 0% rice husks and 8.4% with 40% addition of rice husks, bringing them closer to the lower range of the international standard of 7-10%. Apparent porosity averaged 13% with 0% rice husks and 17% with 40% addition of rice husks bringing them closer to the acceptable range of 20-80%. Solid density averaged 2.9g/cm3 with 0% rice husks and 2.6g/cm 3 with 40% rice husks, still bringing them closer to the international range of 2.3-3.5g/cm3 while thermal conductivity was 0.515W/mk with 0% rice husks and 0.142W/mk with 40% rice husks thereby improving their insulating properties.
Key Words: Insulating, effects, rice husks, clay, kaduna State
Wireless Mesh Networks (WMNs) consist of mesh routers and mesh clients for their lifetime, multihop wireless mesh networks (WMNs) experience frequent link failures caused by channel interference, dynamic obstacles, and/or applications' bandwidth demands. Dynamic channel allocation for effective autonomous network reconfiguration system (E-ARS), by analyzing E-ARS, it shows that by using E-ARS alone it wont provide a sufficient result such as network quality, leader assigning problems etc, so in order improve the network performance we going to implement a new concept Breadth First Search Channel Assignment (BFS-CA) algorithm against with E-ARS so that it will multi radio configuration for mesh network and channel assignment problems. We demonstrate our solution's through the evaluation of a prototype implementation in an IEEE 802.11 in ns2. We also report on an extensive evaluation via simulations. In a sample multi-radio scenario, our solution yields performance more gains compared E-ARS.
Keywords: IEEE 802.11, multiradio wireless mesh networks (mr-WMNs), E-ARS, BFS-CA networks, wireless link failures.
India is the country where the drought problem in villages is a major issue. Every year people have to suffer from the problem of water scarcity, although government allocate water tanker to each village but it is not guaranteed that it will reach to that particular village on time. So we focus on the water supply in drought areas in India. Our project is based on water tanker reach ability, monitoring and controlling system in which the numbers of tankers provided to the particular village are checked by detecting the signals from tankers to the well over some specific distance. It also checks the water level in well by using sensors. Each village is having a server which is able to keep records of all the water tankers with date and time and water level in well. These records are accessed by an administrator in the home ministry which is connected to each other through network. The most important advantage in this application is to avoid the problem of water scarcity. Advanced RF communication is used for signals. RF is used because RF is capable of penetrating almost from every object. It is least affected by environment factors. Many types of wireless devices make use of RF fields. Thus this application can be one of the greatest boons in order to avoid drought problem. This advanced idea if implemented in India will definitely add to the technological development of our country. Finally, we conclude that embedded system is an emerging field and there is a huge scope for research and development.
Keywords: IIS: Internet Information System, LPT: Line Print Terminal, TTL: Transistor-Transistor Logic, RF: Radio Frequency, WAN: Wide Area Network
This article describes a project that controls the tobacco barn temperature to specified levels. The
major components of this controller include the temperature sensor, the processor and electronic switches. The
PIC 16F876A is the heart of the controller, from which decisions are done upon receiving the status of the barn
temperature via the LM35DZ sensor. The μProcessor makes adjustments by reducing or increasing hot air into
the barn. The electronic power switches are realised from the triacs that are appropriately rated in terms of
current and voltage handling.
The controller has a simple display composed of seven segment LED display. Further, the controller
has flexibility in that the controls are done in software. If changes are to be made, this can be achieved through
software, without affecting the hardware. The temperature can be gradually increased enhancing better curing
rather than just setting a fixed temperature at once as is the case with traditional approach.
Keywords: controller, sensor, interrupts, analogue to digital converter, amplification, interfacing, switching, common anode, seven segment, decoder, regulator, initialization.
[1] Texas Instruments Application notes
[2] Operational Amplifiers with Linear integrated circuits by William Stanley published by Charles E. Merril Publishing Company.
[3] Microprocessors Electronics book Series published by McGraw-Hill Inc.
[4] Analogue to Digital Conversion techniques by David F Hoeschele Jr. Published by John Wiley and Sons, Inc.
The Present work is focused on the study of wear behaviour of Aluminium alloy (6063) –Zircon sand composite produced by the stir casting technique by controlling various casting parameters. The pin on disk apparatus is used to analyze the wear rate of the composite. Here the combination of composites investigated is 0, 2, 4, 6, 8 wt% of ZrSiO4 with the matrix and it is found that the increase in reinforcement increase the wear resistant property.
Key words: Aluminium Alloy, Zircon Sand, Stir casting, Wear test.
A Mobile Ad hoc Network is an infrastructure-less multi-hop wireless network. A node
communicates directly with other mobile nodes within the wireless range and indirectly with nodes that are not
within the wireless range of each other. Transmission power of the nodes plays an important role here. In a multi
hop communication scenario, it is possible to minimize the total energy for reaching a higher distance by
repeated low power transmissions. The objective of this work is to study the behavior and performance of the three frequently used MANET routing protocols with respect to different transmission power of individual
nodes of the network. We have selected Destination Sequenced Distance Vector (DSDV) Routing Protocol, Ad
Hoc On-Demand Distance Vector (AODV) Routing Protocol and Dynamic Source Routing (DSR) Protocol for
this study. We analyzed the positive and negative impact of increase in transmission power of individual nodes
on the performance of these routing protocols. The arrived results are more significant and can be used in the
design of new power aware routing protocols.
Key Words: AODV, DSDV, DSR, MANET, transmission power, Power Aware Routing Protocols.
The Research work would indicate certain m-commerce transaction as automatic transaction and semiautomatic transaction. The work proves Broadcasting and its receiving agent based M-commerce business model based automatic transaction and semi automatic transaction. There is a vital role of embedded system for the automatic business transaction. The advance system is establishing transaction based on present model. Broadcasting and its receiving agent based M-commerce business model perform transaction through (1) T.V Broadcasting, (2) Radio Broadcasting,(3) Telephone Broadcasting,(4) Web casting, (5) Satellite Broadcasting (6) Cable Radio Broadcasting. M-commerce driving factors played important role for the present transactions. Research Inspection Report, questionnaire used as research methodology for proving the automatic and semi automatic transaction based on the present model. The work observes extending transaction of M-commerce based on Broadcasting and its receiving agent based M-commerce business model.
Keywords: M-Commerce
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